What do these "ALG" setting on my router mean, and what is "ALG"?
12 "ALG" here stands for "Application-layer Gateway". That is, firewall modules which cope with some peculiarities of those protocols. On a stateful firewall, the "state" is usually tied to just addresses and …
For better security, should I enable or disable these ALG firewall ...
May 18, 2020 · Those ALG rules once enabled create exceptions on the firewall to allow the related network services (example: pptp vpn, or sip telephony), if the service is not used keep them …
ipsec - Can someone help me understand ALG and VPN settings on my ...
I'm looking at the settings in my TP-LINK WDR4300 router and noticed settings for VPN passthrough and ALG. Every single option is enabled but I am hoping someone can help me understand these …
wireless router - How to access Nokia FastMile 5G14-B ... - Super User
May 23, 2025 · Go to the Security / ALG & DMZ / DMZ Configuration, choose the internal router and then Enable DMZ. Remember to press the Save changes button every time you change any settings.
networking - Can’t Access Port-Forwarded Services on Frontier Arris ...
Aug 4, 2025 · Disabled UPnP, ALG, etc. Verified NAT is Disabled DMZ is Disabled (haven’t tried enabling it yet) Device Configuration: NUC has SSH running and accessible internally on …
Why SIP-ALG in routers and modems? - Super User
Without SIP-ALG you may have one-way audio on VoIP conversations (see below). Unfortunately the SIP-ALG in many routers is poorly implemented and causes more problems than it solves. If you …
Port 21 is open but I can't connect to FTP server - Super User
Sep 1, 2015 · It's rare to find a NAT gateway with FTP ALG code to allow a server behind the NAT to be reached via Passive FTP, but it's somewhat less rare to find a NAT gateway with ALG code to allow …
FTP passive server setup works when it shouldn't work
Jul 3, 2024 · The ALG mode: the server ignores passive port settings, if any, and generates a random port on its own on every PASSV command from client. The router automatically opens this port.
vpn - What does the OpenVPN 'auth' directive do? - Super User
Oct 28, 2023 · The Reference manual for OpenVPN 2.4 defines the auth parameter, which overrides this same parameter in the config file, as follows: --auth alg Authenticate data channel packets and (if …
Upgrading OpenVPN 2.4.7 to 2.5.6 results in frequent disconnects
Apr 1, 2022 · When using OpenVPN 2.4.7 on my server (Ubuntu Server 20.04) and connecting from a 2.5.6 client (also Ubuntu 20.04), I can connect with no issue. However, when I try to use OpenVPN …